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It seems much easier to shoot down a defenseless, slow-moving thing in low earth orbit than something on earth or underground (which could be covered by SAMs, patrolled by fighter jets, shielded by thick cement).
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How easy is it to shoot down a satellite moving at 17,500 mph? I think the issue is more how predictable its orbit is but last minute maneuvering at those speeds may be enough to dodge? Deep underground may be better tho.
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https://en.wikipedia.org/wiki/Anti-satellite_weapon
It's only getting easier. You also don't necessarily need to shoot it down. You can try to hit it with another satellite, or use directed energy. If you're desperate, you can try to trigger Kessler.
Meanwhile, on the ground you can rest in the relative safety of layered air defense.
You have limited fuel for manoeuvring.
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